/Engine/Source/Runtime/Core/Public/Math/Color.h
Quantizes the linear color and returns the result as aFColor. This bypasses the SRGB conversion. Uses floor quantization, which does not match the GPU standard conversion. Restoration to float should be done with a +0.5 bias to restore to centered buckets. Do NOT use this for graphics or textures or images, use QuantizeRound instead.
[FColor](API\Runtime\Core\Math\FColor) QuantizeFloor() const